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If the speaker protection is activated then this would indicate that either a dc voltage is appearing across the speakers or a short circuit on one or more speaker cables. Since you are able to get normal sound through the headphone function the former is less likely and you should check for a possible shorting speaker cable. Another possible cause for the symptoms can be dry joints on the speaker protection relays.regards from Vintie

One thing you could look at is that thing that makes the click, it could be a relay and they do go wacky sometimes (hence why it shuts down). If you are lucky it will tell you (on the relay) everything you need to replace it.

The outputs are probably shorted. This unit requries service. I can say though, that once repaired, you will love this unit. Expecta repair cost inteh $150-$200 range. It is worthy it. If the unit is in good condition (appearance), than it is worth $400+ when working.

It is possible, but nlikely that the protection circuit is bad. More common are shorted output transistors or defective driver stage transistors. This should not be a difficult repair for anyone familiar with audio amps. Unsolder/remove Q22 and Q23 and measure the voltages at each of the 3 pads per transistor and post them here.